Fixed typo -- "a" user, not "an" user
Merge pull request #1839 from sbellem/small-typo-fix

Fixed typo -- "a" user, not "an" user
Fixed spelling ("dependant" -> "dependent")

Dependent means reliant on.
A dependant is a person like a child or spouse.

Thanks Andrew Wilcox for the report.
Fixed #21354 -- Document contrib.redirects defaults to 301 redirects